Gumming device



Nov. 29, 1927. 1,651,146

w. E. MOLINS GUMMING DEVICE Filed July 1, 1925 2 Sheets-sheet 1 Fig.4.

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W. E. MOLINS GUMMING DEVICE Filed July 1, 1925 2 Sheets-Sheet 2 Ztlzer 5 Wolf): s

Patented Nov. 29, 1927.

UNITED STATES WALTER EVERETT MOLINS, LONDON, ENGLAND.

GUMMING DEVICE.

Application filed July 1, 1925, Serial No. 40,825, and in Great Britain July .1 1, 1924.

The present invention has reference to improvements 1n devlces for applying adhesive to wrappers, labels, cigarette packages, and

the like, and it relates more specifically to 5 apparatus of the type presenting a container for the adhesive substance in which an adhesive-dispensing member, generally in the form of a disc, is rotatablyrnounted in contact with the adhesive, a portion of the disc projecting from the container and applying thereby the adhesive to the article operated on as required. I p I My invention has for its object the provision of an improved apparatus of the type stated, particularly, but not exclusively, adapted, for use with automatic cigarette and like packaging machines.

To this end the apparatus is provided with means for ensuring a continuous supply of adhesive by keeping the container outlet clear of grit, dust, or other impurities tending to choke it, with means for applying adhesive to certain portions of the object only, and also with means for effecting a break or interruption in the line or stripe of adhesive which the disc applies to the object, so that when for instance cigarette packages are worked up, a portion at one end thereof is left free of adhesive, which is desired in certain types of folded packages. 7

According to this invention the adhesive applying disc is rotatablymounted in a container presenting a slotin its wall so that a portion of the disc periphery projects out:

3 wardly therethrough into the path of. the traveling packages. The disc fits the slot 7 snugly with the exception at the entry end where the slot is enlarged, and at the other end, the edge where the disc emerges, this edge is provided with a small groove or notch which allows the disc to entrain therethrough a thread of adhesive, whereas the portions of the disc circumference flanking this adhesive thread or strip are constantly wiped free from adhesive by the edges of the large slot.

If desired, a special scraper may be provided at the exit end of the wall slot and the small notch then provided in this scraper, as hereinafter described.

A projection of relatively small extent extends peripherally from the disc, which pro jection is preferably of less width than the disc and extends beyond the J m. tee

thickn disc periphery to the extent of the depth of the small notch through which the adhesive is entrained.

With this arrangement, at each revolution of the disc, its projection serves to clear the notch, and as it is wiped clean by the scraper at the pomt where it emerges from the bath, it leaves a zone or stripe free of adhesive on the article operated on. Thus, a wrapper held in contact with tie disc will receive a 1 continuous line of adhesive until acted upon by the proyection, when'an interruption in the line will occur as long as the projection,

is in contact with the wrapper. In order to make myinvention more read- 1ly understood, I will now describe it in detail'in connection with the accompanying top and side views respectively of the scraper, drawn to a somewhat larger scale,

and Figs. 7 and 8 show details of a modification. I

The improved gummer is shown as applied to the bed plate 2 of a wrapping machine, and the type of packet handled thereby is shown in Fig.- 4. In such a machine two identical gumming devices A and B are used, one on each side of the conveyer. slot C, the one B only being shown in part in Fig. 1. The packet travels between the two gummers A and B on 'an endless belt or apron in well known manner.

Each gumming device comprises a container l for the adhesive substance, and the container is adjustably mounted on the bed plate 2 by means of the slot and set screw arrangement 3 to accommodate various sizes of packets. In the bottom of the container is fitted the stub axle e upon'which the. applicator disc 5 with its boss 5 is free to rotate in the direction of arrow D, Fig. 1. The disc 5 projects with part of its periphery through a slot 11 in the container wall, which slot in the preferred embodiment is enlarged at the end E (Fig 3) the enters the .eentarner. at other end suitable manner.

F the disc makes a close fit with the slot. This enlargement at E is provided for the purpose of preventing adhesive being scraped off the disc at this point where it would accumulate and then soil the passing Into a peripheral groove 1 1n the I scraper making wiping contact with the rim of the disc.

Theapplicator disc may be driven in any As shown, by way of example, it is driven from a main shaft 7 by means of bevel gears 6 and 8, which latter is fixed to the'shaft 9 whose other end extends into a recess in the boss 5, where it is secured by the set screw 10. With this arrangement the upper driving gear as a whole may be lifted for removing the disc and container for cleaning or other purposes. In the machine organization shown in Fig. l G are conveyor pieces, only one 01 which is shown, which travel alongthe slot O. Trapping material M is fed downward through a slot 'min the bed plate 2' and the article to be wrapped is carried through it into'theiolding app'aratusll, which folding apparatus is of standard form and well'known in the art; the adhesive containers 1 with their rotating disks 5 are-shown in their working relationship and it will be seen that the disks project through slots in the folders and electric heaters 19, serving as guides and otherwise, lie in the path of travel of the folded and gummed packets, whereby the applied adhesive is quickly dried.

In operation the disc 5, rotating in the direction of arrow D (Fig. 1), entrains on its rim a thread of adhesive equal in crosssection to substantially the conformation of the small slot or opening bet-ween the tines of the scraper finger 15, the remaining portions ofthe rim have been wiped clean by the tines, thus leaving on the rim onlya narrow streak or thread of adhesive, as described. The segment 13, however, in passing through the cut-out is wiped-clean also and will therefore simply contact with the packet without transferring adhesive thereto.

By adjusting'the position ofthe'segment 13 on the disc and timing thereby its passing" relative to the movement of the'packet ast: the gumming device, it is possible to apply adhesive to the packet only where it is needed; v

In the packet P, shown in llig. a, the top flap T of the wrapper is about to be turned" down, after adhesive has been applied in a line Q to the lower flap B. As in this instance adhesive is not wanted on the part S, the applicator disc has been accurately timed to give this result. I

It may be found necessary to provide the disc with more than one segment 13, if for each revolution of the disc severalinterruptions in the gumming operation are required. lino interruption in the adhesive line'is wanted, the segment 13 is to be" replaced by asmall pin which then acts as a Wiper to periodically clear the slot in the scraper and prevent the slot from being clogged with adhesive. i i

In a modification I may dispense" with the seraper I l and the cut-out 15 (Figs. 7 and 8 must be left between the rim of the applicator disc and the slot 11 to allow the adhesive to pass by the projecting segment or segments 13 on the disc, making a lightlywiping contact with the slot edge as it is of the Width of the disc and contacts'above andbelow with the slot edge. i

What I claim is V 1. Apparatus for applying adhesive for the purposes described, comprising, an"- adhesive receptacle, a' disk rotatablymounted to permit the periphery-thereof to take up adhesive material from the receptacle; a scraper operative to remove excess {adhesive from the periphery of the disk, and an interrupting projectionupon the periphery of the disk and adapted inthe'rot'ation of'the disk to periodically wipe. against said scraper. 1

2'. Apparatus for applying adhesive tor the purposes described, comprising anadhesive receptacle, a disk rotatably' mounted to permit the periphery thereof tot'ake up adhesive material from the receptacle, a slotted scraper arranged for engagement with the periphery of the disk to remove therefrom the supply of adhesive except upon that portion alining with the scraper slot, and aprojection upon the periphery of the disk adapted inthe rotation of the disk to wipe-against the scraper for the removal of adhesive from the scraper to keep the slot t'hereotclea-r.

3; Apparatus for applying adhesive for the purposes described, comprising an adhesive receptacle,'a= disk rotatably mounted to permit the periphery thereof to take up adhesive material from the receptacle, and

in which instance sufficient clearance.

a resilient scraper having spaced tines e'nwalls, said slot being widened at one end, a disk rotatably mounted in said receptacle to take up adhesive material from the receptacle and having a portion of its periphery projecting outwardly through said slot, the opposed faces of the disk adjacent to the projecting portion of its periphery being in engagement with the Walls of the slot at such enlarged end of the slot and lying out of contact with said walls at such end of the slot.

5. Apparatus for applying adhesive for the purposes described, comprising a receptacle having a slot, a disk rotatably mounted in the receptacle so as to take up adhesive material therefrom and having a portion of its periphery projecting outwardly through said slot, and a scraper at one end of said slot arranged to overlie and contact with the periphery of the disk, said scraper having a slot disposed between opposed scraping surfaces thereof, whereby a stream of adhesive of a cross-section equal to the area of the slot will be allowed to remain upon the periphery of the disk, while the portions of the periphery of the disk on each 'side of the line of the slot will be scraped free of adhesive by said opposed scraping surfaces of the scraper.

6. Apparatus for a plying adhesive for the purposes describec, comprising an adhesive receptacle having a discharge slot, a rotary disk mounted in the receptacle and having a portion of its periphery projecting outward through said slot, scraping means on the receptacle for removing excess ad-- hesive from portions of the periphery of the disk, vand a segmental interrupting projection extending around a portion of the periphery of the disk arranged for engagement with the scraper for the removal of adhesive from the scraper to keep the slot thereof clear.

In testimony whereof I aflix my signature.

WALTER EVERETT MOLINS. 

